linux-kernel - RE: [patch 01/41] cpu_alloc: Increase percpu area size to 128k

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Message-ID: <1FE6DD409037234FAB833C420AA843EC0188382F@orsmsx424.amr.corp.intel.com>
Date:	Tue, 10 Jun 2008 12:54:44 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	"Christoph Lameter" <clameter@....com>
Cc:	<akpm@...ux-foundation.org>, <linux-arch@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	"David Miller" <davem@...emloft.net>,
	"Eric Dumazet" <dada1@...mosbay.com>,
	"Peter Zijlstra" <peterz@...radead.org>,
	"Rusty Russell" <rusty@...tcorp.com.au>,
	"Mike Travis" <travis@....com>
Subject: RE: [patch 01/41] cpu_alloc: Increase percpu area size to 128k

> > > -#define PERCPU_PAGE_SHIFT	16	/* log2() of max. size of per-CPU area */
> > > +#define PERCPU_PAGE_SHIFT	17	/* log2() of max. size of per-CPU area */
> > 
> > Don't you need some more changes to the alt_dtlb_miss handler in
> > ivt.S for this to work?  128K is not a supported pagesize on any
> > processor model.
>
> Ok so this needs to be 18?

Yes. 18 will work (256K is an architected page size, guaranteed to be supported
by all processor models ... SDM 2:52 table 4-4).

-Tony

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